放射诊断学已有１００多年历史。目前，在世界范围内每年接受Ｘ线检查的受检者高达１６亿人次，所受到的年集体有效剂量高达１６０万人ＳＶ，从事放射诊断的工作人员约有２０万人以上［１］。世界卫生组织（ＷＨＯ）八十年代初估计，放射学费用占整个卫生事业费的６％—１... Radiology Diagnostics has more than 100 years of history. At present, the number of subjects receiving X-ray examination in the world reaches as many as 1.6 billion annually, and the annual effective dose of the group is as high as 1.6 million SVs. There are more than 200,000 radiological staff members involved. [1] World Health Organization (WHO) estimated in the early 1980s that radiology costs account for 6% of the total health care expenses ...